Several held broken packages prevent upgrade to xenial

[Dan Dart]

Many packages (all attached in apt.log) are marked broken on wily->xenial upgrade. But I don't know more.

ERROR Dist-upgrade failed: 'E:Unable to correct problems, you have held broken packages.'

I haven't personally put any packages on hold.

Logs should explain more, I'm not sure what packages to downgrade...

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: ubuntu-release-upgrader-core 1:15.10.14.4
Uname: Linux 4.6.0-rc3+ x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CrashDB: ubuntu
Date: Fri Apr 22 21:26:39 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-01-08 (105 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_GB
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to wily on 2016-04-22 (0 days ago)

[Brian Murray (brian-murray)]

Reviewing the files from your upgrade attempt you seem to have enabled a PPA that provides Xorg packages. This will prevent the upgrade as that PPA contains different versions of packages essential to Ubuntu. The page, https://launchpad.net/~xorg-edgers/+archive/ppa, contains details on to how to revert to the official Xorg packages for the xorg-edgers PPA. Instructions for reverting to official Xorg packages should be similar for the PPA that you have enabled.

[Dan Dart (dandart)]

Ah, thanks. Turns out it was oibaf/graphics-drivers that needed purging out, and then it was happy to attempt the upgrade. Ta.